a(n) = Sum_{k=0..n} (2*k+1) * binomial(5*n-3*k+1,n-k)/(5*n-3*k+1).
A390711
a(n) = Sum_{k=0..n} (2*k+1) * binomial(5*n-3*k+1,n-k)/(5*n-3*k+1).
Terms
- a(0) =1a(1) =2a(2) =9a(3) =59a(4) =464a(5) =4036a(6) =37394a(7) =361752a(8) =3611342a(9) =36924037a(10) =384695774a(11) =4069309941a(12) =43587515276a(13) =471807637123
External references
- oeis: A390711